Tool-holder.



. H. -A. ELLIS.

TOOL HOLDER.

APPLICATION FILED SEPT- 22. I916.

Patented Dec. 18,1917.

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BY I I %7 TORNE) HU1VIPHREY ALFRED ELLIS, or RIDLEY PARK, PENNSYLVANIA.

( TOOL-HOLDER.

Specification of Letters Patent.

' Patented Dec. 18, 1917..

Application filed September 22, 1916. 'Seria1No.'1 21,644.

To all whom it may concern I Be it known that I, HUMPHREY A. ELLIS, a citizen of the United States, residing at 'Ridley Park, in the county of Delaware and State of'Pennsylvania, have invented certain new and useful Improvements in Tool-Holders, of which the following is a specification.

The present invention relatesto tool holders for lathes, planers and other metal working machines and has for its principal object to provide a tool holder of simple, efficient and inexpensive construction, the practicability and commercial value of which surpasses that of present day tool holders. Other and further objectswill appear in the following description. 1

The invention consists of the improvements hereinafter described and finally claimed.

The nature, 1 characteristic features and scope of the invention will be more fully understood from the following description taken in connection with the accompanying drawing forming part hereof and in which:

Figure 1 is a top or plan view of the tool holder embodying the invention.

Fig. 2 is a view in side elevation thereof.

Fig. 3 is a front View thereof; and

Fig. 4 is a somewhat diagrammatic view in plan illustrating the principle of application of the tool holder of the invention.

For the purpose of illustrating my invention, I have shown in the accompanying drawings one form thereof which is at present preferred by me, since the same has been found in practice to give satisfactory and reliable results although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized and that my invention is not limited to the precise arrangement and organization of the instrumentalities as herein shown and described.

In the drawings, the tool holder is shown as embracing a shank portion provided with a two part head, the configuration of the combined parts being substantially arrowshaped. The shank portion is designated 10 and terminates in an integral head portion 11 the forward end of which is blunt as at 12 and the sides of which are inwardly tapered as at 13, see Fig. 3. The top of the head is in a plane below that of the shank top for the reception of the other part 14 of the head. Upon each side of the head 11 is formed a ledge 15, the vertical walls 16 of which are-so formed that'they do not parallel the angularside edges of theliead 151. Thus formed the 'rea r-of the'ledge'is-of greater width than is the front thereof the purpose of whichwill presently appear. The part of the head designated 14: is removable-and is provided with a dowel pin 17 at its rear end for engagement within the top of head 11. This head 1% is substantially acorn-shape in plan the rear or stem 18 of which abuts against the "shoulder 19,0f shank 10. The length "of' this head is so proportioned that the'for'war'd, pointed end thereof terminates short of the forward end of the head 11. The sides thereof overhang the ledges 15 so as to form tool receiving slots. Fixed within head 11 and projected up through an opening in head 14 is a stud" bolt 20, a nut21- being pre'sent'for securely clamping'the head 14 down upon the to of head 11. I u f In practice a t'oola 'ofde'sign suitable for the character of'worl'r to be done is fitted between the two heads upon eitherside thereof as may be desired and 'the'heads clamped with respect to one another. In this connection it is to be noted that av cutting edge 22 of the tool slightly overhangs an angular side of the head 11, that the forward end of the tool is but slightly exposed and that the intermediate tool portion is well supported between the clamped heads. In this connection, it is to be observed that the tool abuts against the vertical wall 16 of the lower head throughout the entire length of said wall. Thus strain and stress exerted upon the tool in making a cut is taken care of by the lower head without deleterious effect to the tool point. In other words, the rear wall 16 so supports the tool that breaking of the tool point is obviated. Prevention of the breaking of the tool point is of the essence of the present invention. Practice demonstrates that such tool holders as are now upon the market, from a practical stand point, are commercially unvaluable for lack of this feature. Further by forming the head 14 as illustrated, clearance for metal shavings is provided for. As shown in Fig. 4, in shaping a piece of work having a flanged portion, the cutting edge 6 of the too-l smooths up the face of the flange after a cut has been effected. Because of the blunt front of the head 11 and the tapered sides thereof, the tool holder may be fed very close up to Work to be done.

It will now be apparent that I have devised a novel and useful construction which embodies the features of advantage enumerated as desirable in the statement of the invention and the above description and while I have in the present instance shown and described the preferred embodiment thereof which has been found in practice to give satisfactory and reliable results, it is to be understood that the same is susceptible of modification in various particulars without departing from the spirit or scope of the invention as set forth in the claims or sacrific ing any of its advantages.

WVhat I claim is:

1. A device of the character stated embracing a shank having formed integral therewith a head provided with angular faces, a ledge formed upon each side of said integral head the vertical wall of each ledge being disposed at an angle to an angular face, a removable head fitted upon the integral head so as to overhang said ledges the forward end of which head terminates short of the front of the integral head and means for clamping the two heads with respect to one another.

2. A device of the character stated embracing a shank, the forward end of which terminates in an integral head, the top of which is in a plane below the shank top, said head having angular faces, a ledge formed upon each side of the integral head, the vertical wall of each ledge being disposed at an angle to an angular face, a removable head having a dowel pin fitted upon the first mentioned head, the removable head overhanging said ledges, the forward end of which removable head terminates short of the front of the integral head and means for clamping the two heads with respect to one an-v other.

3. A device of the character stated embracing a shank, the forward end of which terminates in an integral head, the top of which ledges, the pointed end of which removable I- head terminates short of the blunt front of the integral head and means for clamping the two heads with respect to one another. In testimony whereof, I have hereunto signed my name.

HUMPHREY ALFRED ELLIS. W'itnesses:

WILLIAM J. JAGOBSON, HELEN M. BYRNE.

Copies of this patent may he obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

